I can't delete "Archived" device from my account (FIXED)

[REDACTED]

I recently experimented with transfer Android device between accounts.
After these experiments, I found one "Archived" device in my account.
I know this is old record of this device.

I want to delete this device:
1) click "REMOVE" button
2) question appears: "Do you really want to delete this device from your account? (OK/CANCEL)"
3) click "OK" button
4) question disapperars

Everything remains as before.

Also I found similar topics:
https://forum.avast.com/index.php?topic=163172.0
https://forum.avast.com/index.php?topic=160812.0

[REDACTED]

One more topic:
https://forum.avast.com/index.php?topic=163434.0

There are backup files (pictures, sms, etc) exists in my archived device.
I thought that if I delete these files, I can remove the device.
But when I try to do this, an error occurs ("!!!undefined!!!").

[REDACTED]

Now it works.
I'm happy

09.02.2015: Now "archived" devices exist and deletable.